In a cPanel server, the dedicated IP address usage is listed in the “/etc/domainips” file. You can simply find the dedicated IP address of a particular domain from here. Here, I am explaining a simple backend script for listing all domains which has dedicated IP address under a reseller account. You must have an idea about the following cPanel backend files for listing this.

/etc/trueuserdomains - Have domain name with username.
/etc/trueuserowners - User name with true owner.
/etc/domainips - Have domains with dedicated IP address.

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